Klaus Wunderlich - The Phase4 World of Klaus Wunderlich
This certainly stirs my right hand into action (how else do I operate the stylus?) but I have to wonder how Klaus felt about such imagery adorning the cover of his work. He strikes me as a no nonsense kind of guy, and he may not have approved of this sort of titillation.
Straight after recovering from this shocking image, I had a look at the back of the cover; finding that decency had triumphed with a tasteful shot of the man himself, and not a rear view of this young lady. She's probably in her seventies now.